The countries that grow the most illegal Opium are Pakistan, Burma, Thailand, and Afghanistan, which is also the worldâs top supplier of Opium. Opium can also be grown in places like Mexico and Columbia. Afghanistan accounts to over 90% of the worldâs grown Opium.
This equation, I = V / R, tells us that the current, I, flowing through a circuit is directly proportional to the voltage, V, and inversely proportional to the resistance, R. In other words, if we increase the voltage, then the current will increase.
The three basic principles for this tutorial can be explained using electrons, or more specifically, the charge they create: 1  Voltage is the difference in charge between two points. 2  Current is the rate at which charge is flowing. 3  Resistance is a materialâs tendency to resist the flow of charge (current).